A building is 1 ft from a 7-ft fence that surrounds the property. A worker wants to wash a window in the building 10 ft from the ground. He plans to place a ladder over the fence so it rests against the building. (See the figure.) He decides he should place the ladder 7 ft from the fence for stability. To the nearest tenth of a foot, how long a ladder will he need? He will need a ft ladder. 7 ft 7 ft 1 ft (Type an integer or decimal rounded to the nearest tenth as needed.)